1 files changed, 143 insertions, 0 deletions
diff --git a/lldb/source/Host/common/UDPSocket.cpp b/lldb/source/Host/common/UDPSocket.cpp
new file mode 100644
index 000000000000..7accbb651ba9
--- /dev/null
+++ b/lldb/source/Host/common/UDPSocket.cpp
@@ -0,0 +1,143 @@
+//===-- UDPSocket.cpp -------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Host/common/UDPSocket.h"
+
+#include "lldb/Host/Config.h"
+#include "lldb/Utility/Log.h"
+
+#ifndef LLDB_DISABLE_POSIX
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#endif
+
+#include <memory>
+
+using namespace lldb;
+using namespace lldb_private;
+
+namespace {
+
+const int kDomain = AF_INET;
+const int kType = SOCK_DGRAM;
+
+static const char *g_not_supported_error = "Not supported";
+}
+
+UDPSocket::UDPSocket(NativeSocket socket) : Socket(ProtocolUdp, true, true) {
+  m_socket = socket;
+}
+
+UDPSocket::UDPSocket(bool should_close, bool child_processes_inherit)
+    : Socket(ProtocolUdp, should_close, child_processes_inherit) {}
+
+size_t UDPSocket::Send(const void *buf, const size_t num_bytes) {
+  return ::sendto(m_socket, static_cast<const char *>(buf), num_bytes, 0,
+                  m_sockaddr, m_sockaddr.GetLength());
+}
+
+Status UDPSocket::Connect(llvm::StringRef name) {
+  return Status("%s", g_not_supported_error);
+}
+
+Status UDPSocket::Listen(llvm::StringRef name, int backlog) {
+  return Status("%s", g_not_supported_error);
+}
+
+Status UDPSocket::Accept(Socket *&socket) {
+  return Status("%s", g_not_supported_error);
+}
+
+Status UDPSocket::Connect(llvm::StringRef name, bool child_processes_inherit,
+                          Socket *&socket) {
+  std::unique_ptr<UDPSocket> final_socket;
+
+  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_CONNECTION));
+  LLDB_LOGF(log, "UDPSocket::%s (host/port = %s)", __FUNCTION__, name.data());
+
+  Status error;
+  std::string host_str;
+  std::string port_str;
+  int32_t port = INT32_MIN;
+  if (!DecodeHostAndPort(name, host_str, port_str, port, &error))
+    return error;
+
+  // At this point we have setup the receive port, now we need to setup the UDP
+  // send socket
+
+  struct addrinfo hints;
+  struct addrinfo *service_info_list = nullptr;
+
+  ::memset(&hints, 0, sizeof(hints));
+  hints.ai_family = kDomain;
+  hints.ai_socktype = kType;
+  int err = ::getaddrinfo(host_str.c_str(), port_str.c_str(), &hints,
+                          &service_info_list);
+  if (err != 0) {
+    error.SetErrorStringWithFormat(
+#if defined(_WIN32) && defined(UNICODE)
+        "getaddrinfo(%s, %s, &hints, &info) returned error %i (%S)",
+#else
+        "getaddrinfo(%s, %s, &hints, &info) returned error %i (%s)",
+#endif
+        host_str.c_str(), port_str.c_str(), err, gai_strerror(err));
+    return error;
+  }
+
+  for (struct addrinfo *service_info_ptr = service_info_list;
+       service_info_ptr != nullptr;
+       service_info_ptr = service_info_ptr->ai_next) {
+    auto send_fd = CreateSocket(
+        service_info_ptr->ai_family, service_info_ptr->ai_socktype,
+        service_info_ptr->ai_protocol, child_processes_inherit, error);
+    if (error.Success()) {
+      final_socket.reset(new UDPSocket(send_fd));
+      final_socket->m_sockaddr = service_info_ptr;
+      break;
+    } else
+      continue;
+  }
+
+  ::freeaddrinfo(service_info_list);
+
+  if (!final_socket)
+    return error;
+
+  SocketAddress bind_addr;
+
+  // Only bind to the loopback address if we are expecting a connection from
+  // localhost to avoid any firewall issues.
+  const bool bind_addr_success = (host_str == "127.0.0.1" || host_str == "localhost")
+                                     ? bind_addr.SetToLocalhost(kDomain, port)
+                                     : bind_addr.SetToAnyAddress(kDomain, port);
+
+  if (!bind_addr_success) {
+    error.SetErrorString("Failed to get hostspec to bind for");
+    return error;
+  }
+
+  bind_addr.SetPort(0); // Let the source port # be determined dynamically
+
+  err = ::bind(final_socket->GetNativeSocket(), bind_addr, bind_addr.GetLength());
+
+  struct sockaddr_in source_info;
+  socklen_t address_len = sizeof (struct sockaddr_in);
+  err = ::getsockname(final_socket->GetNativeSocket(), (struct sockaddr *) &source_info, &address_len);
+
+  socket = final_socket.release();
+  error.Clear();
+  return error;
+}
+
+std::string UDPSocket::GetRemoteConnectionURI() const {
+  if (m_socket != kInvalidSocketValue) {
+    return llvm::formatv("udp://[{0}]:{1}", m_sockaddr.GetIPAddress(),
+                         m_sockaddr.GetPort());
+  }
+  return "";
+}